LED Backlight Current Control for Higher Lighting Efficiency
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In liquid crystal display devices, light-emitting diodes (LEDs) operated at higher currents to achieve greater luminance result in energy waste due to inefficient lighting efficiency, typically below 70%, leading to increased power consumption.
Innovation Solution
An electronic device with a driving circuit substrate and light emitting units, where active elements provide currents to the LEDs, optimizing the operating current range to achieve lighting efficiency between 70% and 100%, reducing power consumption by adjusting the number and operation of LEDs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light-emitting diodes are operated at higher current to generate greater light emitting luminance, then the luminance of a single light-emitting diode is improved, but the lighting efficiency deteriorates (below 70%)
Solution Approach 1:
The patent divides the backlight system into multiple independently controllable light-emitting diodes instead of using a single high-power LED. This segmentation allows individual LEDs to operate at lower, more efficient current levels while collectively providing the required luminance through parallel operation.
Solution Approach 2:
The patent implements dynamic control of LED operation by using active elements (transistors) to individually switch and regulate current to each LED. This dynamic control enables the system to adjust which LEDs are active and at what current level, optimizing the balance between luminance output and lighting efficiency.
2Illumination intensity
If more light-emitting diodes are operated at higher current to achieve required luminance, then the luminance requirement is met, but power consumption increases due to energy waste
Solution Approach 1:
The backlight system is segmented into multiple LEDs that can be independently controlled. Instead of operating fewer LEDs at high current (which wastes energy), the patent uses more LEDs operating at lower, more efficient current levels, reducing overall power consumption while maintaining required luminance.
Solution Approach 2:
The patent changes the operating parameters of the LEDs by controlling the current level for each individual LED. By adjusting the current parameter to optimal ranges and using active elements to regulate power delivery, the system achieves better energy efficiency while meeting luminance requirements.
3Device complexity
If fewer light-emitting diodes are used to reduce cost, then the device complexity is reduced, but lighting efficiency deteriorates due to higher operating current requirements
Solution Approach 1:
The patent applies segmentation by using multiple LEDs instead of fewer high-power LEDs. Although this increases the component count, it enables each LED to operate in its optimal efficiency range, ultimately reducing energy waste and improving overall system performance.
Solution Approach 2:
The patent changes the operating parameters by controlling current distribution to multiple LEDs. This parameter control allows the system to achieve better lighting efficiency compared to using fewer LEDs at higher currents, resolving the trade-off between device complexity and energy efficiency.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach lowers power consumption and increases contrast by maintaining required luminance with fewer LEDs, while allowing for individual control of LED emission, thereby enhancing display performance.
Implementation Method 1
light-emitting diodes would be designed to be operated at a higher current to generate greater light emitting luminance
Data Source
AI summary
An electronic device including a driving circuit substrate, a plurality of light emitting units, and a first passivation layer is provided. The driving circuit substrate includes a plurality of active elements, the light emitting units are disposed on the driving circuit substrate, wherein each of the light emitting units is electrically connected to the corresponding active element. The first passivation layer covers the light emitting units. One of the active elements provides a first current to the corresponding light emitting element, such that the lighting efficiency of the light emitting units is ranged from 70% to 100%.